---
product_id: 81903514
title: "BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp"
brand: "black+decker"
price: "$103.63"
currency: USD
in_stock: true
reviews_count: 6
url: https://www.desertcart.ec/products/81903514-black-decker-bm3b-fully-automatic-6v-12v-battery-charger-maintainer
store_origin: EC
region: Ecuador
---

# 1.5 Amp smart charging 6V/12V AGM, GEL & WET battery compatible Built-in overcharge & reverse polarity protection BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp

**Brand:** black+decker
**Price:** $103.63
**Availability:** ✅ In Stock

## Summary

> 🔌 Power up smartly — never miss a charge, always stay ready!

## Quick Answers

- **What is this?** BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp by black+decker
- **How much does it cost?** $103.63 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/81903514-black-decker-bm3b-fully-automatic-6v-12v-battery-charger-maintainer)

## Best For

- black+decker enthusiasts

## Why This Product

- Trusted black+decker brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First Design:** ETL certified with built-in circuit protection against reverse polarity and short circuits.
- • **Compact & Convenient:** Lightweight 1.2 lb charger with built-in mounting bracket for effortless placement anywhere.
- • **Dual Connection Options:** Choose between easy battery clips or secure O-ring terminals for versatile setup.
- • **Smart Auto-Stop Charging:** Prevents overcharging by switching to float mode once full, preserving battery life.
- • **Universal Battery Compatibility:** Seamlessly charges 6V and 12V AGM, GEL, and WET batteries for all your vehicles.

## Overview

The BLACK+DECKER BM3B is a fully automatic 1.5 Amp battery charger and maintainer designed for 6V and 12V AGM, GEL, and WET batteries. Featuring dual connection options with cable clamps and O-ring terminals, it ensures universal fit and easy installation. Its smart charging technology automatically stops charging and switches to float mode to protect battery health. ETL certified with built-in protections against overcharging, reverse polarity, and short circuits, this compact charger includes a mounting bracket for convenient placement.

## Description

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp

## Features

- Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries
- Easy connection to vehicle battery using battery clips or O-ring terminals
- Stops charging automatically when battery is fully charged or topped off, switching to float mode monitoring
- Built-in circuit protection guards against overcharging, reverse polarity, or short circuit; ETL certified for performance and safety
- Mounting bracket built-in to charger for convenient placement
- Fit type: Universal Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 1.2 Pounds |
| Item Dimensions D x W x H | 3"D x 5"W x 8.9"H |
| Color | Multi |
| Energy Specifications Met | ETL |
| Current Rating | 1.2 Amps |
| Input Voltage | 12 Volts |
| Output Voltage | 12 Volts (DC) |

## Product Details

- **Brand:** BLACK+DECKER
- **Color:** Multi
- **Product Dimensions:** 5"D x 1.6"W x 2.6"H
- **Item Weight:** 1.2 Pounds
- **Output Voltage:** 12 Volts (DC)

## Images

![BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp - Image 1](https://m.media-amazon.com/images/I/81xP3NK1SmL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: How is it compare to Axtra 3.6 amp car battery charger?**
A: This is only a 1.2A charger.  Yes, Mr. Krueger, IT IS A BATTERY CHARGER.
The more amperage, the better because a higher amperage charger will charge much quicker.  I really can't believe that there are so many chargers out now with such pathetically low amperages...

**Q: How is Black Decker 1.5 amp battery charger compares to Axtra 3.6-amp battery charger maintainer?**
A: The Black & Decker battery charger has been out a while and gets good ratings. The Axtra 3.6 battery is new but has very good specifications. If you are in an area with wide temperature ranges, the Noco Genius 5 has a temperature sensor so it's operational range is -4 F to 110 F.

**Q: What is the float voltage?  When the charger indicates it is done charging what is the voltage of the battery?**
A: As this is a "true float charger", the maintenance voltage is dependent upon the Full Charge Voltage (FCV) of the battery, which is usually anywhere from 12.6 to 13.2 depending on battery design and how much sulfation has taken place on the internal plates.  Unlike chargers that use a "trickle maintenance mode" with a fixed voltage output, the B&D unit senses when the battery will accept no more current (full charge) and then stops sending voltage and rests until the battery voltage drops below that threshold and then it should "wake up" and start charging again.

**Q: how fast does it charge**
A: Math will tell you.  If it's a 1.5 Amp charger and you're trying to charge a 7 Ah battery, 7/1.5 = 4.7 hours till full charge.  If it's a 50 Ah battery, 33.3 hours till full charge (50/1.5 = 33.3).  But, there's typically about a 20% efficiency loss, so it's really more like 5.6 hours and 40 hours for these examples.However, you may not need full charge if you're wanting to charge a battery that will be installed in a car or bike that has an alternator which will continue to charge it while it's running.  Also, it's not a good idea to use too powerful of a charger to charge the battery quickly.  For example, using a 5 Amp charger on a 2 Ah battery will charge it VERY quickly, but could overheat and shorten the live and cycles of the battery.  Different battery chemistry allows for different charging amps.  But in all cases, low and slow is better for the life of the battery and safety than fast charging.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works perfectly
*by K***S on July 28, 2025*

Installation is simple, and the fact that you don’t need to keep pushing buttons every time you use it, makes it very convenient, just select 6 or 12 volts, move the slider to the voltage required, intel the unit in a hidden place in your vehicle, just leave the electric plug 🔌 visible where it’s convenient for you, I connected a volt meter to the car battery, to make sure everything worked as intended, and as soon as I plugged to the wall, I saw the volts claiming up, confirming a successful installation, don’t be deceived by the price, it’s worth every penny and more

### ⭐⭐⭐⭐⭐ Good
*by G***S on June 24, 2025*

Great all round trickle charger. Works well on cars, motorcycles and lawnmower. Easy to use. Very reliable

### ⭐⭐⭐⭐⭐ Working well for 8 years now
*by M***R on July 16, 2024*

Somehow the world has made me come back to this product page a little over 8 years later and I figured I would write a quick review.TL;DR - Charger works well and has given me zero issues.Pros:The cord is plenty long for my garage outlet so I don't even need an extension cord when plugging in my "race car" as my kids call it. I only get to drive it once every few weeks so I throw this charger on there just to not worry about the battery possibly going dead. The power inverter is in the middle and can be mounted so you could possibly run power from an outlet, mount it on the wall or a workbench, and then have a good amount of cable to plug in a battery, depending on your application.It includes several ways to connect to the battery terminals. I just use the clamps and I have not had any issues. They are pretty sturdy and should hold up to normal use without issues.The unit has an easy to understand switch and lights for status. Switch to convert it from 6V to 12V, depending on what you are charging. The status light has simple icons that give a good indication of what the charger is doing.Cons:Not an issue for me but something you should be aware of with this (and likely most chargers of this type in this price range) charger is that it's not going to be super fast at charging a battery that is very low. Most of the time, that's not a big deal as its intended to maintain a battery that is sitting for long periods of time. Just don't assume you can plug this into a dead battery and come back an hour later and have it ready to go. Depending on how empty the battery is and how much power is needed to turn whatever you are powering over, it will likely take longer than that.Overall, well worth the 20 something bucks I spent on it. Not something I can always say with stuff from Amazon these days.

## Frequently Bought Together

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-17*